"if I'm going to pay 200-250 pesos for a short time session on top of the exit drinks and tips, I might as well just go to Montreal where roughly the same amount of money can get me a full hour "
For those with little experience in BA, I think you will find that "short time" there never means a 10-20 minute quickie with the girl watching the clock - whether a street girl, club girl or escort. I never had a rushed session. But on several occasions I had a tough time getting them to leave. One club girl after telling me we had an hour, fell asleep for 2 and was in no hurry to leave after she woke up. Several street women wanted to stay the whole night.
Remember, part of what you are paying for is to get them to leave. My strategy has been to pay the minimum - for an hour. You usually get twice that if you are nice to her and for me, that is plenty of time. Should I happen to fall in love with her - and I always judge that AFTER I come - well you can always offer her some more money for more time. I see no sense in negociating a TLN with a girl you don't know and haven't tried before. And as noted many will leave anyway, because they have kids at home etc. Maybe I'm just getting old but after an hour or two of serious screwing I'm usually ready for her to go . . .
Peace, -P